Trolley.



PATENTED FEB. 7, 1905.

E. H. MILLER.

TROLLEY.

APPLIOATION FILED SEPT. so. 1904.

UNITED STATES Patented February '7', 1905.

PATENT OEETQE.

EDIVARD H. MILLER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HARRY CARR, HARRY E. \VEAVER. AND LOUIS H. ROSENTHAL, OF PITTSBURG, PENNSYLVANIA.

TROLLEY.

SPECIFICATION forming part of Letters Patent No. 781,962, dated February '7, 1905.

Application filed September 30,1904. Serial No. 226,610.

1'0 11.71 whom, it may concern:

Be it known that I, EDWARD H. MILLER, a citizen ofthe United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Trolleys, of which the l()ll()\\lllg is a specification, reference being 1 had therein to the accompanying drawings, forming part of this specilication, in which Figure l is a front elevation, partly in section, of nrvimproved trolley. Fig. 2 is a plan view. Fig. 3 is an end view. Fig. A is a crosssection on the line IV IV of 1. Figs. 5 and 6 are cross-sections on the line V V and \"l VI of Fig. 3.

My invention refers to improvements in trolleys, and relates particularly to the construction of the device whereby it is adapted to automatically regain its position of engagement with the trolley-wire and to prevent complete disengagement or separation therefrom.

The invention is designed to simplify devices of this general character and to provide a trolley having the additional features of supplemental guards, guiding or fending terminals, together with a novel design or construction having in view simplicity and eheapness of manufacture, together with the added advantages of providing contact-surface for the tr lley-wire at all points.

The invention also has in view the construction of a strong, simple, and etlicient harp or frame.

Referring now to the drawings, 2 represents the ordinary trolley-pole, the upper end of which is clamped to the harp consisting of the oppositely-located sides 3:5,made of thin metal, preferably dished outwardly, as shown in cross-section in Fig. 6, providing a thin wall having rounded exterior faces, thus combining strength and lightness. The meeting ends of arms 3 are semicylindrical in their interior construction and are provided with flanges or lugs 4: 1, by which the arms are clamped upon the end of the trolley-pole by bolts, as shown, or by rivets or bolts passing through the hubs of the arms and through the terminal of the l trolley-pole, for which purpose I provide supplemental rivet or bolt holes 5. These are designed to be utilized in case of breakage of the flanges 4.

The arms 3 are provided at their outer upper extremities with iournal-bearings (5, having suitable oil-holes? and terminating in upwardly inwardly extending horns 8, as clearly shown in Figs. 2 and 3, adapted to engage the trolley-wire in case the trolley should swerve laterally suflieiently far without engaging the wire by the spiral groove. Journaled within the bearings 6 is the trolley-wheel, consisting of a single metallic member having at its middle portion the main contact-wheel 9, at each side of which the cylindrical extensions extend laterally for some distance, terminating in bearing extremities l0. Immediately inside of these hearings at each end are collars 11. arranged to bear against the inner sides of the frame-bearings and beveled inwardly, as shown, thus facilitating the immediate returning of the trolley to engagement with the wire at one end or the other by the spiral groove. These lateral cylindrical extensions of the wheel are hollow, the walls being only of suflicient thickness to provide proper strength and material for the spiral grooves l2 12, which commence at each end at the base of the beveled collars II and develop inwardly toward the wheel. each spiral groove terminating and leading into a rising groove 13, which liually leads into the main groove of the wheel 9 at each side. It will thus be seen that the entire trolley-wheel, being formed of a single piece, with its central wheel, spiral grooves, beveled collars, journal-bearings, and hollow interior, may be cast or otherwise suitably formed in a single piece of metal at a minimum cost. A special advantage of this construction is that it entirely dispenses with the necessity of a central bearing-bolt or othersupplemental bearingdevices of any kind and when embraced by the harp provides a strongserviceable device and is well adapted to the objects in view.

The operation of my invention will be apparent from the foregoingdescription. \Vhen for any reason the trolley becomes dislodged from the wire, the wire will be immediately reengaged by the spiral groove at one side or the other, owing to the upward tendency of the spring-controlled trolley-pole, and the groove will make good electrical contact with the wire and by friction against it will immediately rotate the wheel, feeding the wire inwardly and into the main Wheel again. By rounding the edges of the grooves it will be seen that the trolley will immediately become seated against the wire, thus preventing sparking or ineflicient contact. v

The wheels and their lateral extensions or barrels may be of any dimensions desired, and various changes or modifications may be made in the general design, construction, or other details by the skilled mechanic without departing from the scope of the following claims.

What I claim is 1. The combination with a trolley-wheel having integral bearing-terminals, of a supporting harp or frame provided with outer horizontal bearings and havingupwardly-extended inwardly-turned horns located outwardly beyond the central wheel at each side, substantially as set forth.

2. The combination with a trolley-wheel having integral bearing-terminals; of a supporting harp or frame consisting of two out wardly-bowed parts having outer horizontal bearings, upwardly-extended inwardly-turned horns located outwardly beyond the central wheel at each side, and means for securing the two parts together and to the trolley-pole, substantially as set forth.

3. A trolley-wheel formed of a singlemetallic body having a central wheel, lateral cylindrical extensions thereof provided with inwardly-directing spiral grooves terminating in rising grooves leading into the central wheel, and having journal-bearings at their extremities with inner beveled collars, substantially as set forth.

4. A trolley-wheel formed of a single metallic body, hollow longitudinally through its center, having a central wheel, lateral cylindrical extensions thereof provided with inwardly-directing spiral. grooves terminating in rising grooves leading into the central wheel, and having journal-bearings at their extremities, with inner beveled collars. substantially as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

EDWVARD H. MILLER.

W'itnesses:

J. F. MOKEN A, (J. M. CLARKE. 

